Notices
924/931/944/951/968 Forum Porsche 924, 924S, 931, 944, 944S, 944S2, 951, and 968 discussion, how-to guides, and technical help. (1976-1995)
Sponsored by:
Sponsored by:

Rod Bearing DIY?

Thread Tools
 
Search this Thread
 
Old 08-14-2008, 11:46 PM
  #1  
MyBlackCar
Pro
Thread Starter
 
MyBlackCar's Avatar
 
Join Date: Jan 2006
Location: San Francisco, CA
Posts: 517
Likes: 0
Received 0 Likes on 0 Posts
Default Rod Bearing DIY?

Does anyone have a link to a current DIY for the rod bearings? Paragon's and Pelican's pages no longer exist.

I found out that my oil pan gasket is developing a leak that is dripping on my exhaust. When I decide to spring for a new gasket (yes, I read of the horror of dropping the crossmember), I might order the rod bearings, too.

A lot of you have mentioned this job can be done completely from the bottom end. What I do not understand is how the top portion of the rod bearing comes out of the bottom? I am sure I need more info to understand this process.

Thanks.

Last edited by MyBlackCar; 08-15-2008 at 01:57 AM.
Old 08-15-2008, 05:29 AM
  #2  
FRporscheman
RL Community Team
Rennlist Member
 
FRporscheman's Avatar
 
Join Date: Jun 2004
Location: San Francisco Area
Posts: 11,014
Received 20 Likes on 15 Posts
Default

If the top part of the bearing stays on the crank, then you can either slide it down under, or you can turn the crank over so it's facing down.

If the top part of the bearing stays on the rod, then you can turn the crank over so it's out of the way, then (if needed) pull the rod down far enough to have access, then pluck it off the rod.

I've actually never done this with the engine in the car so maybe I missed a detail, but I watched a friend do it to his, and yes you can definitely do it with the engine in.
Old 09-26-2008, 07:35 PM
  #3  
MyBlackCar
Pro
Thread Starter
 
MyBlackCar's Avatar
 
Join Date: Jan 2006
Location: San Francisco, CA
Posts: 517
Likes: 0
Received 0 Likes on 0 Posts
Default

Here is another question about rod bearings. After talking to my mechanic, he says the engine needs to be out because it would be difficult to check for clearance on the bearings. Therefore, the engine must be out of the car to do it right. There is a plastic tool that is needed for this job.

What is checking for clearance and what is this plastic tool? Is it that strip like thing that Pelican sells? Can it be done with the crank and engine in the car?

http://www.pelicanparts.com/catalog/...pg7.htm#item42
Old 09-26-2008, 07:49 PM
  #4  
Spidey944
Rennlist Member
 
Spidey944's Avatar
 
Join Date: Aug 2007
Location: Phoenix, AZ
Posts: 3,481
Likes: 0
Received 4 Likes on 4 Posts
Default

dont forget www.clarks-garage.com
Old 09-26-2008, 08:11 PM
  #5  
Mike C.
Drifting
 
Mike C.'s Avatar
 
Join Date: Aug 2002
Location: Eastern CT
Posts: 3,224
Likes: 0
Received 1 Like on 1 Post
Default

I've done this job 'in the car'. At TDC, the number 1 and 4 pistons are all the way up, while number 2 and 3 are at BDC. So set engine at TDC, remove oil pan and do 2 and 3 first. Once you unbolt the bearing cap, you will be able to (carefully) push the rod/piston up, away from the crank. Then you slip out the upper bearing shell, install the new one. Install a new bearing shell in the lower cap. Wipe off the crank journal with a CLEAN rag or paper towel. The plastic mentioned is Plasti-gage. Google it and you'll see how it's used. Obtain it at any good auto parts store. Put a length of p-g in the lower bearing cap across the shell at bottom. Bolt the bearing cap back on using the old connecting rod nuts, torque to spec (you will use new nuts for final assy). Do not rotate crank. Now remove the bearing cap to reveal the squashed p-g and compare squash width to the little chart that comes with p-g. This tells you the bearing clearance. If acceptable, wipe off the p-g, apply oil/assy lube and reinstall the bearing cap with new nuts, torque to spec. Move on to number 3, repeat. Then rotate crank so numbers 1 and 4 are at bottom.... Getting oil pan off is the bigger part of the job.
Old 09-26-2008, 08:30 PM
  #6  
MyBlackCar
Pro
Thread Starter
 
MyBlackCar's Avatar
 
Join Date: Jan 2006
Location: San Francisco, CA
Posts: 517
Likes: 0
Received 0 Likes on 0 Posts
Default

Awesome! That clears things up a lot. I might just do the oil pan and rod bearing myself. And I was finally able to find a cached version of Paragon's Rod Bearing DIY. Clarks Garage's version is pretty hard to follow if one has not done it before.

http://web.archive.org/web/200411251...x_v2&id=70&c=4
Old 09-26-2008, 09:25 PM
  #7  
FRporscheman
RL Community Team
Rennlist Member
 
FRporscheman's Avatar
 
Join Date: Jun 2004
Location: San Francisco Area
Posts: 11,014
Received 20 Likes on 15 Posts
Default

That's a great link! Thanks!
Old 09-28-2008, 01:01 AM
  #8  
AlpharettaRK
Addict
Rennlist Member
 
AlpharettaRK's Avatar
 
Join Date: May 2004
Posts: 680
Likes: 0
Received 3 Likes on 3 Posts
Default

I would strongly recommend slipping a piece of fuel line hose over the rod bolts once the lower half is removed. This will prevent damaging the crank should you slip while pushing it up to remove the upper bearing shell.
Old 09-28-2008, 11:36 AM
  #9  
Mike C.
Drifting
 
Mike C.'s Avatar
 
Join Date: Aug 2002
Location: Eastern CT
Posts: 3,224
Likes: 0
Received 1 Like on 1 Post
Default

Yes, I forgot that..



Quick Reply: Rod Bearing DIY?



All times are GMT -3. The time now is 01:22 AM.